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Calculating cubic roots with conditions

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Hello everyone

I am using Comsol 3.5a and I am trying to perform a calculation but unfortunately it seems not to work. I am using Comsol just to solve differential equations and , hence, I am using the mathematical tool that is incorporated. My domain is a square with variables x and z and side equal to 10 dimensionless units. What I want is to calculate the square root of (x^2-y^2) but only for x>y. In all other cases I want the outcome to be 0. I tryied to use absolute value (using the abs(x^2-y^2)) but it seems that in that way I also create solutions for x<y , as well.

Also I am trying to use a condition like: sqrt (x^2-y^2)*(x>y) but also is not working.

Do you have any idea what should I do?

Thank you very much

Yuri

1 Reply Last Post Aug 21, 2017, 8:13 a.m. EDT
Jeff Hiller COMSOL Employee

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Posted: 7 years ago Aug 21, 2017, 8:13 a.m. EDT
How about sqrt((x^2-y^2)*(x>y)) ?
Jeff
How about sqrt((x^2-y^2)*(x>y)) ? Jeff

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